list1 =[1,1,1,2,2,2,3,4,4,5,7,68,9]
set1 =set(list1)
print(set1)
dict1 ={}
print(type(dict1))
set1.pop()
print(set1)
dict2 ={'name':'jfnrg','age':20,'sex':'男'}
print(dict2.keys())
